HTC CM-2007 User manual

CM-2007 Digital Clamp Meter
Manual
This meter is precise equipment. Please read this manual
carefully before any operation to avoid any damage to you and
the meter.
CONTENT
SUMMARY………………………1
SAFETY NOTICE………………………1
GENERAL FEATURES…………………………1
TECHNICAL FEATURES…………………………1
PANEL DESCRIPTION…………………………1
OPERATION INSTRUCTIONS…………………………1
DCV MEASUREMENT…………………1
ACV MEASUREMENT…………………1
ACA MEASUREMENT…………………1
RESISTANCE MEASUREMENT………………………1
DIODE AND CONTINUITY TEST……………1
NCV MEASUREMENT…………………1
TEMPERATURE MEASUREMENT………………………1
MAINTENANCE…………………………1
TROUBLE SHOOTING…………………………1
1. SUMMARY
This 3 3/4 Digit Highly Stable clamp meter uses two AAA (1.5V)
batteries. It has a LCD with 18mm digit display, which makes the
reading clearer and the operation more convenient. It can test DCV,
ACV, ACA, resistance, NCV, temperature, diode and continuity test.
This meter also equips data hold function with unit symbol display,
can work in both auto and manual range, and provides auto power off,
clamp light, backlight and warning functions. To assure high
accuracy and resolution, it adopts an 8-bit microprocessor and a dual
integral A/D convertor IC .It is an ideal tool for labs, factories
radio-technology and household.
2. SAFETY NOTICE
The instrument is designed according to IEC1010-1(EN61010-1),
Pollution 2, CAT III 600V and UL3111-1 standard (safety standard
issued by International Electro technical Committee). Please read the
followings carefully before any operation.
2.1 Introduction for safety symbols:
: Be careful! Operator must refer to manual.
: Low battery indication.
: Warning! Existing High Voltage.
: Dual Insulation.
2.2 Notice:
2.2.1 Please read the manual carefully and strictly obey the
instructions to avoid any human health and meter damage.
2.2.2 To avoid electric shock and damage to the meter, please
disconnect the input signal and remove away the test leads before
opening the cover. Avoid the water leakage into the cover.
2.2.3 DO NOT do any test if the cover hasn’t been completely
installed or screws not tightened up.
2.2.4 DO NOT input the value higher than the limit at every range.
2.2.5 DO NOT input any voltage at Resistance range.
2.2.6 Switch OFF the meter after used.
2.2.7 Please take out the batteries for long-time storage to avoid
leakage damage.
2.2.8 Be careful when the testing over DCV 60V and ACV 30V..
2.2.9 To avoid electric shock, please be seriously careful when
nipping the bus bar or something insulated.
3. FEATURES
3.1 GENERAL FEATURES
3.1.1 Display: LCD.
3.1.2 Max. Display: 4000 digits (3 3/4) and auto polarity display.
3.1.3Clamp Max.open: 28mm
3.1.4 Over-range display: “OL” displayed.
3.1.5 Hold: DATA HOLD.
3.1.6 Relative measurement.
3.1.7 Sampling rate: approx.3 times/sec.
3.1.8 Low battery indicator: “ ”displayed.
3.1.9 Continuity test: Approx. less than （50±10）Ωbuzzer sounds.
3.1.10 Auto or manual range.
3.1.11 Auto power off.
3.1.12 Power consumption: about 3mA.
3.1.13 Power: 2 × 1.5V batteries (AAA 7#battery).
3.1.14 Working environment: (0～40)℃, relative humidity: <70%.
3.1.15 Dimension: 123mm×270mm×35mm (width×length×height).
3.1.16 Weight: approx. 280g (including batteries).
3.1.17 Accessories: user manual, test leads, temperature sensor banana
probe TP01, 2pcs 1.5V batteries, black pouch, gift box
3.2 TECHNICAL FEATURES
3.2.1 Accuracy:± (a% × reading data + digits). To assure accuracy, the
environment temperature should be (23±5) ℃, relative humidity be
<70%.
One year accuracy guarantee since production date.
3.2.2 Temperature Coefficient: 0.1* Specified Accuracy/1℃(<18℃
or >28℃)
3.2.3 DC voltage (DCV)
Range Accuracy Resolution
400mV ±(1.0% reading+5）0.1mV
4V
±(0.5% reading+5）
1mV
40V 10mV
400V 100mV

600V 1V
Input impedance: at 400mV range >40MΩ, at other ranges are
10MΩ.
Overload protection: 1000V DC or 750V AC peak value.
3.2.4 AC voltage (ACV)
Range Accuracy Resolution
400mV ±(1.5% reading+5）0.1mV
4V
±(1.0% reading+5）
1mV
40V 10mV
400V 100mV
600V 1V
Input impedance: at 400mV range >40MΩ, at other ranges are
10MΩ.
Overload protection: 1000V DC or 750V AC peak value.
Frequency response: at 600V range: 40~100Hz,
at other ranges:40~400Hz.
Display: average value response (based on sine wave RMS).
3.2.5 AC current (ACA)
Range Accuracy Resolution
400A <40A: ±(3.0%
reading+5）
>40A: ±(2.0%
reading+5）
100mA
600A 1A
Overload protection: >800A, input time<1 minute.
Frequency response: 40Hz-200Hz.
Display: average value response (based on sine wave RMS).
3.2.6 Resistance
Range Accuracy Resolution
400Ω±(0.8% reading+5）0.1Ω
4kΩ
±(0.8% reading+3）
1Ω
40kΩ10Ω
400kΩ100Ω
4MΩ1kΩ
40MΩ±(1.2% reading+5）10kΩ
Overload protection: 250V RMS.
NOTE: DO NOT input any voltage value at this range!
3.2.7 Capacitance test
Range Accuracy Resolution
4nF ±(5.0% reading+20）1pF
40nF
±(3.5%reading+10）
10pF
400nF 100pF
4uF 1nF
40uF 10nF
200uF ±(5.0%reading+10）100nF
Overload protection: 250V RMS.
NOTE: DO NOT input any voltage value at this range!
3.2.8 Frequency test
Range Accuracy Resolution
100Hz
±(0.5% reading+5）
0.1Hz
1kHz 0.1Hz
10kHz 1Hz
100kHz 10Hz
1MHz 100Hz
10MHz 1kHz
Input sensitivity: >0.7V.
Overload protection: 250V RMS.
3.2.9 Temperature test
Range Accuracy Resolution
（-40～750）℃
＜400℃±（1.0%+5）
≥400℃±（1.5%+15）
1℃
Sensor: K type banana plug (Ni-Cr-Nickel silicon).
NOTE: DO NOT input any voltage value at this range!
3.2.10 Continuity Test
Range Description Test Conditions
Diode forward
voltage drop
Forward DC
current is approx
0.5mA, reverse
voltage is
approx 1.5V.
When the resistance
under test is less
than 50±10Ω,
buzzer sounds
continuously.
Open circuit
voltage: 0.5V
Overload protection: 250V RMS.
Note: DO NOT input any voltage value at this range!
4. OPERATION
4.1PANELDESCRIPTION (refertopicture1)
Jaw: 0 to 600 AC current and NCV detecting
device.
Clamp gunlock: Pressing the gunlock can turn on
or off the clamp.
Hand protection: A safe design to protect users
from touching the dangerous area.
Clamp light: Opening the clamp light can light up
the tested area in the dark to prevent the danger.
NCV indicator: Detect the existence of the high voltage around to

prevent the electric shock.
Function choosing switch: Used to select the function, range or turn
on or turn off the clamp meter.
Function Description
ACA measurement.
ACV,DCVmeasurement.Press“SELECT”toswitchthemeasurementmode.Press“Hz/DUTY”toswitchtoFrequency/Dutycyclemeasurementmode .
NCV Non-contact voltage test.
Ω
Press “SELECT” to switch to Diode, Continuity,
Capacitance and Resistance measurement mode.
Hz Frequency measurement.
/℃℉
Temperature measurement. Press “SELECT” button to switch
to ℃or ℉.
Function key.
LIGHT button: Backlight and Clamp light control key. Press
LIGHT button more than 2 seconds, backlight and clamp light will be
on. Press this button again, the backlight and clamp light will be off.
The backlight will auto turn off after 5 seconds if not pressing it again.
SELECT button: Function selection key. Press this button to select the
measurement mode: Under “ ” mode, choose DC or AC. Under
“Ω” mode, choose “ ” “ ” “ ”, “Ω”measurement.
HOLD button: Press “HOLD” button, the current testing value will
be kept displayed on the LCD, and press this button again to cancel this
function. When this function works, user cannot do any new test.
REL button: Press this button to clear the readings and enter into the
Relative measurement mode and a “REL” symbol will be displayed on
the LCD. Press this button again to cancel this function.
LCD: Displaying measurement value and unit.
No. Symbol Description
- Indicates negative readings.
AC AC measurement.
DC DC measurement.
Auto Auto range.
Null.
Diode test.
Continuity beeper is on.
HOLD Data hold
REL Relative measurement.
Low battery indication.
○
11
hFE
℃，℉
NCV
nF，uF
MΩ，kΩ，Ω
mV, V
uA，mA，A
Hz，kHz，MHz
Null.
℉null.
Non-contact voltage testing.
nF，uF
MΩ，kΩ，Ω
mV, V
uA，mA，A
Hz，kHz，MHz
V/Ωinput terminal: Measurement inputs positive terminal (red
test lead).
COM input terminal: Measurement inputs negative terminal (black
test lead).
Carrying belt.
4.2 ACA MEASUREMENT
(1) Turn the rotary switch to
range.
(2) Open the clamp jaw and grip one
wire and get the reading directly.
To get the most precise reading, should user put the wire in the
middle of the close jaw (refer to the picture 3).
Note:
1. Firstly users should select the highest range, if users are
not sure about the range of current under test, and then select the
proper range based on displaying value.
2. DO NOT input the current higher than the limit, or it
would damage the meter.
4.3 ACV MEASUREMENT
(1) Turn the function swift to range.
(2) Insert the black test lead into “COM”
terminal, and the red one into “V/Ω” terminal.
(3) Connect the test leads into the circuit and get
the measurement value from the LCD. (refer to
picture 4)
(picture4)
Note:
1. DO NOT input the voltage over the limit, or it would damage
the meter.
2. Be careful while measuring a high voltage circuit. Do not touch
the high voltage circuit.
4.4 DCV MEASUREMENT
(1) Turn the function swift to DCV range.
(2) Insert the black test lead into “COM” terminal, and
the red one into “V/Ω” terminal.
(3) Connect test leads to the test point. LCD will display
polarity and voltage of the test point connected by the
redtestlead.(refertopicture5)
Note:
1. DO NOT input the voltage over the limit, or it would damage
the meter.
2. Be careful while measuring a high voltage circuit. Do not touch
the high voltage circuit.
4.5 NCV MEASUREMENT
NCV Static electricity or other sources of energy
may randomly trigger the sensor. The result is only
for reference.
4.5.1 Turn the rotary switch to NCV position.
4.5.2 Hold the top of the meter very close to the
voltage source under test.
4.5.3 If voltage is present, the NCV LED will flicker rapidly or
intermittently
NOTE:
1. Even no indication when NCV test, there might still voltage be.

Do not use this NCV test function to judge the existence of
voltage.
2. The test result might be affected by many factors such as the
design of the socket and the thickness of insulation material.
3. The LED light might glow when user inputs voltage into the
meter terminal.
4. Flashlight or motor driver and other external sources may cause
disturbance and might cause the wrong results.
4.6 DIODE AND CONTINUITY TEST
4.6.1 Set the rotary switch to “ Ω” range. The original state is
diode measurement mode.
4.6.2 Forward measurement: Connect red test lead to the
positive polarity and the black test lead to the cathode
polarity of the diode. LCD will display the approx. value
of forward voltage drop.
4.6.3 Backward measurement: connect red test lead to
the cathode polarity and the black test lead to positive polarity of the
diode. LCD will display “OL”.
4.6.4 The complete diode testing includes forward and backward
measurement. If the result doesn’t meet the descriptions above, it means
the diode is broken.
4.6.5 Press “SELECT” key to select the continuity measurement mode.
4.6.6 Insert the black test lead into “COM” terminal, and the red one
into “V/Ω” terminal.
4.6.7 Connect test leads to two points of tested circuit, if the resistance
is less than (50±10) Ω, the buzzer sounds.
Note:
1. DO NOT input any voltage value at this range!
4.7 RESISTANCE MEASUREMENT
4.7.1 Set the rotary switch to “ Ω” range and press “SELECT”
to swift to “Ω” range.
4.7.2 Insert the black lest lead into “COM” terminal and the red one
into “V/Ω” terminal.
4.7.3 Connect the test leads to the measured resistance
to get the measurement value (refer to picture 8).
Note:
1. Before measuring in line resistor, make sure that the
power is off and all capacitors have discharged
completely.
2. Do not apply any voltage at resistance range.
3. When input terminal is in open circuit, LCD will display “OL”.
4. If there is an “OL” displayed on the LCD, it means it is over range,
switch to a higher range. When the test leads are shorted, there would
be about 1Ωstray resistance.
4.8 CAPACITANCE TEST
4.8.1 Set the rotary switch to “ Ω” range and
press “SELECT” to swift to “ ” range.
4.8.2 Insert the black test lead into “COM” terminal,
and the red one into “V/Ω” terminal (refer to picture
9).
4.8.3 Press “REL” key to clear the reading to make the LCD displayed
zero.
4.8.4 Connect the capacitor to “COM” and “V/Ω” terminal. (Note: the
red test leads is for positive pole +). LCD displays capacitance value.
Note:
1. Don’t input voltage or current at Capacitance range.
2. In order to assure the accuracy, please press “REL” to clear the
reading before testing.
3. There is only the auto range mode under the capacitance range.
4. The capacitor must be completely discharged before testing.
5. The reading of 200uF range will take more than 15 seconds to be
stable.
4.9 FREQUENCY MEASUREMENT
4.9.1 Turn the function swift to Hz range. Insert the black lest lead in
“COM” terminal and the red one in “V/Ω”
terminal.
4.9.2 Connect the test leads to the measured
circuit and get the measurement value. (Refer to
picture 10)
Note:
1. In noisy environment, it's better to use shield
cable to measure a low signal.
2. When measuring high voltage circuit, do not touch the high voltage
circuit.
3. Don’t input voltage higher than 250V RMS or it may damage the
meter.
4.10 TEMPERATURE TEST
4.10.1 Set the rotary switch to “℃” range.
4.1.12 Insert the black plug of the thermocouple
sensor into “COM” and red one into “V/Ω” jack,
and put the working terminal (temperature
measuring end) of thermocouple on the surface or
inside the object to be tested. Then you can read
temperature from the screen, and the data is in
Centigrade. (Refer to picture 11)
Note:
1. The meter should be far away high temperature. Use the
thermocouple probe within the specified temperature range.
2. Don’t change the temperature probe randomly, or the accuracy will
not be guaranteed.
3. Don’t input voltage at temperature range.
4.11 AUTO POWER OFF
4.11.1 The meter will auto power off if there is not any operation in 15
minutes and come into dormant mode. The beeper will sound five times
within 1 minute before power-off.
To restart the meter, please press any function key or turn to the
function swift.
4.11.2 Press “SELECT” key and turn on the meter or press “SELECT”
when the meter is in dormant mode to wake up the meter and the
“AUTO POWER OFF” function will be cancelled
5. MAINTENANCE
The meter is a precise instrument. Random changes to the circuit should
be avoided.
Note:
1. When the LCD displays “ ”, please exchange the battery in time.
2. Before replacing battery or fuse, please remove the test leads from
the measuring point and turn off the power.
3. Keep the meter away from water, dust and shock.
4. DO NOT use the meter under high temperature, high humidity,
combustible, explosive and strong magnetic environments.
5. Clean the case of the meter regularly with cleaner. DO NOT use
corrosive solvents, combustible, explosive and strong magnetic
environments.

6. TROUBLE SHOOTING
If the meter does not work properly, please check the meter as
following steps:
(If the problems still cannot be solved, please refer to repairing center
or contact the local dealers.)
Fault Solution
No reading on LCD
Turn on the power
Replace battery
Release the HOLD key
signal appears Replace battery
Big error Value Replace battery

■ The specifications are subject to changes without prior notice.
■ The content of this manual is regarded as correct. If users find out
any mistakes or omissions, please kindly contact the manufacturer.
■ The manufacturer will not be responsible for accidents and damage
caused by improper operations.
■ The functions described in this User Manual shall not be
considered as the reason for any special usages.
EN-2007_V0.0
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